This is a configuration example for mu4e.

I found it online, and it explains how I can have 2 different mu accounts.
#+BEGIN_SRC emacs-lisp

(require 'mu4e)

(Require 'mu4e-multi)

(setq mu4e-mu-binary "/usr/local/Cellar/mu/HEAD/bin/mu")
(setq mu4e-maildir "~/.Maildir")

(setq mu4e-multi-account-alist
  '(("personal"
     (user-mail-address .  "my@personal.com")
     (user-full-name  .   "My Name")
     (mu4e-sent-folder .  "/personal/Sent")
     (mu4e-drafts-folder . "/personal/Drafts")
     (mu4e-trash-folder .  "/personal/Trash")
     (mu4e-refile-folder . "/personal/Archive"))
    ("work"
     (user-mail-address .  "my@work.com")
     (user-fullname . "My Name")
     (mu4e-sent-folder .  "/work/Sent")
     (mu4e-drafts-folder . "/work/Drafts")
     (mu4e-trash-folder .  "/work/Trash")
     (mu4e-refile-folder . "/work/Archive"))))

(mu4e-multi-enable)

(setq mu4e-drafts-folder "/drafts")

;; don't save message to Sent Messages
(setq mu4e-sent-messages-behavior 'delete)

;;set attachment downloads directory
(setq mu4e-attachment-dir  "~/Downloads")

;; setup some handy shortcuts
;; you can quickly switch to your Inbox -- press ``ji''
;; then, when you want archive some messages, move them to
;; the 'All Mail' folder by pressing ``ma''.

(setq mu4e-maildir-shortcuts
    '( ("/personal/INBOX"      . ?i)
       ("/personal/Sent"       . ?s)
       ("/personal/Trash"      . ?t)
       ("/personal/Archive"    . ?a)
       ("/personal/Starred"    . ?p)

       ("/work/INBOX"          . ?w)
       ("/work/Sent"           . ?f)
       ("/work/Archive"        . ?o)
       ))

;; allow for updating mail using 'U' in the main view:
(setq mu4e-get-mail-command "offlineimap")
(setq mu4e-update-interval 300)

;; something about ourselves
(setq
   user-mail-address "my@email.com"
   user-full-name  "my name"
   mu4e-compose-signature
    (concat
      ""
      ""))


(require 'smtpmail)

(setq message-send-mail-function 'smtpmail-send-it
     smtpmail-stream-type 'ssl
     smtpmail-default-smtp-server "my.server.com"
     smtpmail-smtp-server "my.server.com"
     smtpmail-smtp-service 465)

;; don't keep message buffers around
(setq message-kill-buffer-on-exit t)


(defvar my-mu4e-account-alist
  '(("personal"
	 ;; about me
	 (user-mail-address      "my@personal.com")
	 (user-full-name         "my name")
	 ;; smtp
         (smtpmail-stream-type 'ssl)
         (smtpmail-starttls-credentials '(("my.server.com" 587 nil nil)))
	 (smtpmail-default-smtp-server "my.sever.com")
	 (smtpmail-smtp-server "my.server.com")
	 (smtpmail-smtp-service 465))
    ("work"
	 ;; about me
	 (user-mail-address      "my@work.com")
         (user-full-name         "my name")
         ;;(mu4e-compose-signature "")

	 ;; smtp
         (smtpmail-stream-type 'ssl)
	 (smtpmail-auth-credentials '(("my.server.com" 25 "my@work.com" nil)))
         (smtpmail-default-smtp-server "myserver.com")
         (smtpmail-smtp-service 465)
)))

;; Found here - http://www.djcbsoftware.nl/code/mu/mu4e/Multiple-accounts.html
(defun my-mu4e-set-account ()
  "Set the account for composing a message."
  (let* ((account
          (if mu4e-compose-parent-message
              (let ((maildir (mu4e-message-field mu4e-compose-parent-message :maildir)))
                (string-match "/\\(.*?\\)/" maildir)
                (match-string 1 maildir))
            (completing-read (format "Compose with account: (%s) "
                                     (mapconcat #'(lambda (var) (car var))
                                                my-mu4e-account-alist "/"))
                             (mapcar #'(lambda (var) (car var)) my-mu4e-account-alist)
                             nil t nil nil (car my-mu4e-account-alist))))
         (account-vars (cdr (assoc account my-mu4e-account-alist))))
    (if account-vars
        (mapc #'(lambda (var)
                  (set (car var) (cadr var)))
              account-vars)
      (error "No email account found"))))

(add-hook 'mu4e-compose-pre-hook 'my-mu4e-set-account)


;;; Keybindings for mu4e
(require 'evil-mu4e)

;;; Use Dired for attachments
(require 'gnus-dired)
;; make the `gnus-dired-mail-buffers' function also work on
;; message-mode derived modes, such as mu4e-compose-mode
(defun gnus-dired-mail-buffers ()
  "Return a list of active message buffers."
  (let (buffers)
    (save-current-buffer
      (dolist (buffer (buffer-list t))
	(set-buffer buffer)
	(when (and (derived-mode-p 'message-mode)
		(null message-sent-message-via))
	  (push (buffer-name buffer) buffers))))
    (nreverse buffers)))

(setq gnus-dired-mail-mode 'mu4e-user-agent)
(add-hook 'dired-mode-hook 'turn-on-gnus-dired-mode)


(setq mu4e-show-images t)

;;hotkey to load mu4e
(global-set-key [f1]  'mu4e)

;;visual changes
(custom-set-faces
 '(mu4e-title-face ((t (:foreground "#8be9fd"))))
 '(mu4e-link-face  ((t (:forefround "#8be9fd"))))
)

(provide 'init-mu4e)

#+END_SRC
